How can I design a program for a conveyor that always rotates by a motor but will stop and counts when it detects the presence of supermarket goods. Assuming PC1 (on project board) is the sensor to detect the products on the conveyor. The 7 segment's display module (on trainer kit) will be use to display the number of counting products.
The maximum number of products for payment process is 9 units. A switch is used to reset the counter. Internal timer is used as the counter.
In some cases the cashier wants to page the supervisor, an alarm can be triggered by a special switch. Thus, an LED and a buzzer will be fluctuated (ON and OFF continuously) and the conveyor system stops. The switch is connected to the interrupt. The alarm will keep
triggering until the interrupt is released and the normal operation will continue.